AutoCompleteTextView

/**
* 动态匹配的 TextView
*/
public class MainActivity extends AppCompatActivity {

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    /**
     * 1.初始化控件
     * 2.创建一个适配器
     * 3.绑定适配器
     */
    AutoCompleteTextView autoCompleteTextView = findViewById(R.id.auto_complete_textView);

    String[] strings = {"beijing","beijing321", "beijing_tian_an_men", "aomen", "ao_men_da_qiao", "ao_men,_da_dao"};
    ArrayAdapter arrayAdapter = new ArrayAdapter(this,
            android.R.layout.simple_list_item_1, strings);

    autoCompleteTextView.setAdapter(arrayAdapter);

/**
* 1.初始化控件
* 2.创建一个适配器
* 3.绑定适配器
*/
AutoCompleteTextView autoCompleteTextView = findViewById(R.id.auto_complete_textView);

    String[] strings = {"beijing", "beijing321", "beijing_tian_an_men", "aomen", "ao_men_da_qiao", "ao_men,_da_dao"};
    ArrayAdapter arrayAdapter = new ArrayAdapter(this,
            android.R.layout.simple_list_item_1, strings);

    autoCompleteTextView.setAdapter(arrayAdapter);


    /**
     * 1.初始化控件
     * 2.创建一个适配器
     * 3.绑定适配器
     */
    MultiAutoCompleteTextView multiAutoCompleteTextView = findViewById(R.id.multi_auto_complete_textView);
    multiAutoCompleteTextView.setAdapter(arrayAdapter);
    // 设置一个分隔符 用以分割不同 词组

multiAutoCompleteTextView.setTokenizer(new MultiAutoCompleteTextView.CommaTokenizer());

}

}

// 布局文件

<LinearLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <AutoCompleteTextView
        android:id="@+id/auto_complete_textView"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_margin="10dp"
        ***android:completionThreshold="2"***
        android:hint="@string/hint"
        android:textColor="@android:color/holo_orange_light"
        android:textSize="16sp"/>

 <MultiAutoCompleteTextView
        android:padding="10dp"
        android:id="@+id/multi_auto_complete_textView"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:hint="@string/input_recevier" />
LinearLayout>

 ***android:completionThreshold="2"*** 这是表示输入几个文字显示自动匹配的内容